Lined crucible



June 30, 1925.

1,543,905 M. s. CLAWSON LINED CRU CIBLE Filed'July 9, 1923 SIM um o1,

6H0: new

I Patented June 30, 1925. v M

UNITED STATES PATENT, OFFICE. W

MONBOE S. CLAWSON, OF UPPER MONTCL AIR, NEW JERSEY.

LINED CBUOIBLE.

Application filed July 9,

To all whom it may concern:

Be it known that I, MoNRon S. CLAWSON, a citizen of the United States, residing at Upper Montclair, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Lined Crucibles, of which the following is a specification. Y i

This invention relates to resistors or crucibles for use in connection with electric furnaces in which current is passed through the crucible'or resistor and generates heat by the resistance thereof, and has for its object the provision of a crucible which is lined with refractory material to prevent contact of the moltenmetal with the carbon or graphite from which the major portion 'of the crucible is constructed.

An important and more specific object is the provision of a lining which is formed of separate slabs fitting within the concavity within the crucible and having a species of interlocking engagement whereby the indi vidual slabs will be held properly and all will be held in the proper relation. I

' Another object is the provision of a lin- 'ing in which the interengagement of the adjacent parts or slabs prevents floating when the metal becomes molten. Y

An additional object is the rovision of a. device of this character w ich will be sim 1e and inexpensive in manufacture,

.hig ly eflicient and durable in use, and a general improvement in the art. 7

With the above and other objects and advantages in view, the invention consists in the combination and arrangement of parts to be hereinafter more fully described and claimed and illustrated in the accompanying drawings in which:

Figure 1 is a plan view of a crucible constructed in accordance with my invention.

Figure 2 is a longitudinal section on the line 22 of Figure 1.

Figure 3 is a cross section on the line 3-3 of Fi re 1. p

Re erring more particularly to the drawings. I have shown the crucible as comprising a somewhat elongated body 10 which mi ht be rectangular in shape, as shown, or

" which might have any other preferred contour, depending upon the preference of the manufacturer or user. This body is formed of carbon or graphite as these materials ap-. pear to be the most suitable for use in re'-' sistance furnaces. The body 10 is formed 1923. Serial no. 650,271.

' with a cavity or depression 11 for the reception of the material to be melted.

The essential feature of the present invention 1s the provision of a lining which covers the entire surface of the cavity for preventing contact of the molten metal with the carbon or graphite from which the body is "formed. This lining must be of refractory material and in actual practice I have discovered that it will be highly satisfactory inclined walls thereof are slabs 15- which have their lower edges beveled at lt for conforming engagement with the beveled ends 13 of the bottom slab. The side edges of these slabs are beveled, as shown at 17, for a purpose to be described. The lining is completed by two slabs18 which are disposed against the vertical sides of the cavity and which have their side edges beveled, as indicated at 19, for engagement with thebeveled edges 17 of the slabs 15, the lower edge of these slabs 18 being beveled at 20 for engagement with the beveled edges 14 of the base. Owing to the peculiar beveling of the edges of the various elements which consti tute the lining, it is apparent that there is defined a species of interlock which positively holds all the slabs in their proper relation. The side slabs rest upon the bottom slab and operate to prevent floating thereof 9 when the material within the crucible be comes molten.

From the foregoing description and a study of the drawings it will be apparent that I, have thus provided a simply constructed and consequently inexpensive lined crucible in which contact of the molten metal with the carbon material of the crucible body willbe prevented. Owing to the construction of the lining from the various sections or slabs, it is apparent that in case of breakage of any one it may be replaced crucible.

Vhile I have shown and described the preferred embodiment of my invention, it is of course to be understood that I reserve withoutinvolving discarding the whole the rig t to make such changes in the form, construction and arrangement of parts as will not depart from the spirit of the invention or the scope of the subjoined claims.

I claim:

1. A crucible including a body of high resistance material formed with a cavity for the reception of material to be melted, and a lining of refractory material covering the Walls'of the cavity, said lining being formed of sections.

2. A crucible including a body of high resistance material formed with a cavity for the reception of material to be'melted, and a linin of retractorymaterial covering the Walls 01 the cavity, said lining being formed of sections having interfitting engagement.

3. In a crucible, a body of high resistance material formed with a cavity for the reception of material to be melted, and a lining for covering the entire surface of the cavity, the iining consisting of a plurality of separate slabs of refractory material disposed against the respective surfaces of the cavity and having interfitting engagement.

4. A crucible comprising a body of high resistance material formed with a cavity having angularly arranged faces, and a lining of refractory material consisting of separate slabs disposed against the respective angular faces of the cavity, the contacting edges of said slabs being beveled and having conforming engagement to define a species of interlock.

- 5. In a crucible formed from a body of high resistance. material having a cavity therein, the cavity having a bottom wall, upwardly diverging end Walls and upright side Walls, a lining of refractory material consisting ofa plurality of slabs, one arranged upon the bottom Wall and the others being disposed flat against said inclined and upright Walls, all of the slabs having their contacting edges beveled for interfitting engagement and said upright and inclined slabs operating to hold down the bottom slab to prevent floating.

In testimony whereof I hereto atiix my signature.

MONROE S. CLAVVSON. 

